CVE-2022-47939 Use after free in n/a

What is CVE-2022-47939?

CVE-2022-47939 is a critical use after free vulnerability in Linux kernel, published on 23 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.19 before 5.19.2. fs/ksmbd/smb2pdu.c has a use-after-free and OOPS for SMB2_TREE_DISCONNECT.

Weakness: CWE-416

Which versions are affected by CVE-2022-47939?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2022-47939?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2022-47939 being exploited?

There is no known exploitation of CVE-2022-47939 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-12094, DEBIAN-CVE-2022-47939, GHSA-c5f7-v4rr-qv23, UBUNTU-CVE-2022-47939.